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TT: Fachverband Tiefe Temperaturen
TT 9: CE: (General) Theory 1
TT 9.14: Talk
Monday, March 14, 2011, 17:45–18:00, HSZ 201
Simulations of excitons in coupled quantum dots — •Alexander Stark1, Philipp Schneider1, Sergey Grishkevich1,2, and Alejandro Saenz1 — 1Humboldt-Universität, Berlin, Germany — 2Universität des Saarlandes, Saarbrücken, Germany
We present the extension of our program code for two atoms in optical lattices to excitons in coupled quantum dots, i.e. quantum dot molecules. To obtain the eigenvalues and the corresponding wave functions we are using a full configuration-interaction approach based on an one particle B-Spline basis for the radial part and spherical harmonics for the angular part of the wave function. The double well confinement potential is treated in full dimensionality. This allows us to handle variably confined lateral and vertical coupled quantum dots. The separation of the dots can be adjusted from box-like unified dots to nearly full separated individual dots. The interaction between the electron and the hole can be also varied arbitrarily, including the repulsive electron-electron Coulomb potential and possible shielding effects. Further, to study quantum dot molecules in different materials the effective masses of the particles can be set to corresponding values. The next step is to include a time-dependent perturbation and to study the dynamics of the exciton. First results of the calculations are presented.